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-rw-r--r--fs/ubifs/super.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 1309783..4713017 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -35,6 +35,7 @@
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/math64.h>
+#include <linux/writeback.h>
#include "ubifs.h"
/*
@@ -431,6 +432,23 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
struct ubifs_info *c = sb->s_fs_info;
int i, ret = 0, err;
long long bud_bytes;
+ struct writeback_control wbc = {
+ .sync_mode = wait ? WB_SYNC_ALL : WB_SYNC_HOLD,
+ .range_start = 0,
+ .range_end = LLONG_MAX,
+ .nr_to_write = LONG_MAX,
+ };
+
+ /*
+ * VFS calls '->sync_fs()' before synchronizing all dirty inodes and
+ * pages, so synchronize them first, then commit the journal. Strictly
+ * speaking, it is not necessary to commit the journal here,
+ * synchronizing write-buffers would be enough. But committing makes
+ * UBIFS free space predictions much more accurate, so we want to let
+ * the user be able to get more accurate results of 'statfs()' after
+ * they synchronize the file system.
+ */
+ generic_sync_sb_inodes(sb, &wbc);
if (c->jheads) {
for (i = 0; i < c->jhead_cnt; i++) {
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